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An explanation for conflicting records of Triassic-Jurassic plant diversity.
Proc Natl Acad Sci U S A. 2010 Aug 31; 107(35):15351-6.PN

Abstract

Macrofossils (mostly leaves) and sporomorphs (pollen and spores) preserve conflicting records of plant biodiversity during the end-Permian (P-Tr), Triassic-Jurassic (Tr-J), and end-Cretaceous (K-T) mass extinctions. Estimates of diversity loss based on macrofossils are typically much higher than estimates of diversity loss based on sporomorphs. Macrofossils from the Tr-J of East Greenland indicate that standing species richness declined by as much as 85% in the Late Triassic, whereas sporomorph records from the same region, and from elsewhere in Europe, reveal little evidence of such catastrophic diversity loss. To understand this major discrepancy, we have used a new high-resolution dataset of sporomorph assemblages from Astartekløft, East Greenland, to directly compare the macrofossil and sporomorph records of Tr-J plant biodiversity. Our results show that sporomorph assemblages from the Tr-J boundary interval are 10-12% less taxonomically diverse than sporomorph assemblages from the Late Triassic, and that vegetation composition changed rapidly in the boundary interval as a result of emigration and/or extirpation of taxa rather than immigration and/or origination of taxa. An analysis of the representation of different plant groups in the macrofossil and sporomorph records at Astartekløft reveals that reproductively specialized plants, including cycads, bennettites and the seed-fern Lepidopteris are almost absent from the sporomorph record. These results provide a means of reconciling the macrofossil and sporomorph records of Tr-J vegetation change, and may help to understand vegetation change during the P-Tr and K-T mass extinctions and around the Paleocene-Eocene Thermal Maximum.

Authors+Show Affiliations

School of Biology and Environmental Science, University College Dublin, Belfield, Dublin 4, Ireland. luke.mander@gmail.comNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

20713737

Citation

Mander, Luke, et al. "An Explanation for Conflicting Records of Triassic-Jurassic Plant Diversity." Proceedings of the National Academy of Sciences of the United States of America, vol. 107, no. 35, 2010, pp. 15351-6.
Mander L, Kürschner WM, McElwain JC. An explanation for conflicting records of Triassic-Jurassic plant diversity. Proc Natl Acad Sci USA. 2010;107(35):15351-6.
Mander, L., Kürschner, W. M., & McElwain, J. C. (2010). An explanation for conflicting records of Triassic-Jurassic plant diversity. Proceedings of the National Academy of Sciences of the United States of America, 107(35), 15351-6. https://doi.org/10.1073/pnas.1004207107
Mander L, Kürschner WM, McElwain JC. An Explanation for Conflicting Records of Triassic-Jurassic Plant Diversity. Proc Natl Acad Sci USA. 2010 Aug 31;107(35):15351-6. PubMed PMID: 20713737.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - An explanation for conflicting records of Triassic-Jurassic plant diversity. AU - Mander,Luke, AU - Kürschner,Wolfram M, AU - McElwain,Jennifer C, Y1 - 2010/08/16/ PY - 2010/8/18/entrez PY - 2010/8/18/pubmed PY - 2010/11/16/medline SP - 15351 EP - 6 JF - Proceedings of the National Academy of Sciences of the United States of America JO - Proc. Natl. Acad. Sci. U.S.A. VL - 107 IS - 35 N2 - Macrofossils (mostly leaves) and sporomorphs (pollen and spores) preserve conflicting records of plant biodiversity during the end-Permian (P-Tr), Triassic-Jurassic (Tr-J), and end-Cretaceous (K-T) mass extinctions. Estimates of diversity loss based on macrofossils are typically much higher than estimates of diversity loss based on sporomorphs. Macrofossils from the Tr-J of East Greenland indicate that standing species richness declined by as much as 85% in the Late Triassic, whereas sporomorph records from the same region, and from elsewhere in Europe, reveal little evidence of such catastrophic diversity loss. To understand this major discrepancy, we have used a new high-resolution dataset of sporomorph assemblages from Astartekløft, East Greenland, to directly compare the macrofossil and sporomorph records of Tr-J plant biodiversity. Our results show that sporomorph assemblages from the Tr-J boundary interval are 10-12% less taxonomically diverse than sporomorph assemblages from the Late Triassic, and that vegetation composition changed rapidly in the boundary interval as a result of emigration and/or extirpation of taxa rather than immigration and/or origination of taxa. An analysis of the representation of different plant groups in the macrofossil and sporomorph records at Astartekløft reveals that reproductively specialized plants, including cycads, bennettites and the seed-fern Lepidopteris are almost absent from the sporomorph record. These results provide a means of reconciling the macrofossil and sporomorph records of Tr-J vegetation change, and may help to understand vegetation change during the P-Tr and K-T mass extinctions and around the Paleocene-Eocene Thermal Maximum. SN - 1091-6490 UR - https://www.unboundmedicine.com/medline/citation/20713737/An_explanation_for_conflicting_records_of_Triassic_Jurassic_plant_diversity_ L2 - http://www.pnas.org/cgi/pmidlookup?view=long&pmid=20713737 DB - PRIME DP - Unbound Medicine ER -